BARS::4-Way Stop at 13th St. and Farmer Ave. in Tempe, Arizona

These street signs were on the corner of Farmer Avenue and 13th Street in Tempe, Arizona.

The street signs say...

```   +--------------------+
| W. 13th St 400  -> |
| Farmer Ave <- 1300 |
|       STOP         |
|       4-Way        |
+--------------------+

the numbers are:  4  400  13  1300

the math is:  400 / 4 x 13 = 1300

pi to two digits:  3.14
pi to its first 0 digit:  3.14159265358979323846264338327950

[exercise] Digitize the numbers in the street sign.  Print
'n' digits of pi until digitized digits are used.

output is pi having the decimal digits containing four zeros,
two ones, two threes and two fours.

--- to be completed stuff ---

digitize({ 13, 400, 1300, 4 }) = { 1, 3, 4, 0, 0, 1, 3, 0, 0, 4 }
sort(UP, { 1, 3, 4, 0, 0, 1, 3, 0, 0, 4 }) =
{ 0, 0, 0, 0, 1, 1, 3, 3, 4, 4 }

remove(0, { 0, 0, 0, 0, 1, 1, 3, 3, 4, 4 }) =
{ 1, 1, 3, 3, 4, 4 }

uniq({ 1, 1, 3, 3, 4, 4 }) = { 1, 3, 4 }  # uniq is short for unique

swap(1, 3, { 1, 3, 4 }) = { 3, 1, 4 }
```

Creator: Gerald D. Thurman [gthurman@gmail.com]
Created: 09 May 2007